Persian violet vs houseplant

Persian violet and houseplant both are nouns.

Word	Noun	Adjective	Verb	Adverb
Persian violet	Yes	No	No	No
houseplant	Yes	No	No	No

As nouns, houseplant is a hypernym of Persian violet; that is, houseplant is a word with a broader meaning than Persian violet:

Persian violet: perennial cultivated especially as a houseplant for its fragrant bluish to dark lavender flowers
houseplant: any of a variety of plants grown indoors for decorative purposes

Persian violet (noun)	houseplant (noun)
perennial cultivated especially as a houseplant for its fragrant bluish to dark lavender flowers	any of a variety of plants grown indoors for decorative purposes